<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var dog={};

        Object.defineProperties(dog,{
            "name":{
                value:"小狗",
                writable:true
            },
            "color":{
                value:"白色",
                writable:false,
                enumerable:false,
                configurable:false
            }
        });

        console.log(dog.name);
        console.log(dog.color);
    </script>
</body>
</html>